Revisiting the Emission Line Source Detection Problem in Integral Field Spectroscopic Data

Abstract

We present a 3-dimensional matched filtering approach for the blind search of faint emission-line sources in integral-field spectroscopic datasets. The filter is designed to account for the spectrally rapidly varying background noise due to the telluric air glow spectrum. A software implementation of this matched filtering search is implemented in an updated version of the Line Source Detection Cataloguing tool (LSDCat2.0). Using public data from the MUSE-Wide survey we show how the new filter design provides higher detection significances for faint emission line sources buried in between atmospheric [OH]-bands at $\lambda \gtrsim 7000$\,Å. We also show how, for a given source parameterisation, the selection function of the improved algorithm can be derived analytically from the variances of the data. We verify this analytic solution against source insertion and recovery experiments in the recently released dataset of the MUSE eXtreme Deep Field (MXDF). We then illustrate how the selection function has to be re-scaled for 3D emission line source profiles that are not fully congruent with the template. This procedure alleviates the construction of realistic selection functions by removing the need for computationally cumbersome source insertion and recovery experiments.

arXiv commentArticle published in AN

References in corpus (55)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• Detailed Structural Decomposition of Galaxy Images
• A concise reference to (projected) Sersic R^{1/n} quantities, including Concentration, Profile Slopes, Petrosian indices, and Kron Magnitudes
• Diffuse Lyman Alpha Emitting Halos: A Generic Property of High Redshift Star Forming Galaxies
• The Data Processing Pipeline for the MUSE Instrument
• The MUSE Hubble Ultra Deep Field Survey: I. Survey description, data reduction and source detection
• An atmospheric radiation model for Cerro Paranal. I. The optical spectral range
• Extended Lyman alpha haloes around individual high-redshift galaxies revealed by MUSE
• The Keck Cosmic Web Imager Integral Field Spectrograph
• The MUSE 3D view of the Hubble Deep Field South
• The effects of seeing on Sersic profiles. II. The Moffat PSF
• Spectroscopic Confirmation of Three Redshift 5.7 Lyman-alpha Emitters from the Large Area Lyman Alpha Survey
• Intergalactic Transmission and its Impact on the Lyα Line
• The MUSE Hubble Ultra Deep Field Survey: II. Spectroscopic redshifts and comparisons to color selections of high-redshift galaxies
• The HETDEX Pilot Survey. II. The Evolution of the Ly-alpha Escape Fraction from the UV Slope and Luminosity Function of 1.9<z<3.8 LAEs
• Resolving stellar populations with crowded field 3D spectroscopy
• Nearly all the sky is covered by Lyman-alpha emission around high redshift galaxies
• What is the physical origin of strong Lya emission? II. Gas Kinematics and Distribution of Lya Emitters
• The HETDEX Instrumentation: Hobby-Eberly Telescope Wide Field Upgrade and VIRUS
• The Lyman alpha Reference Sample: Extended Lyman alpha Halos Produced at Low Dust Content
• The MUSE-Wide Survey: Survey Description and First Data Release
• The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) Survey Design, Reductions, and Detections
• Detecting Weak Spectral Lines in Interferometric Data through Matched Filtering
• The MUSE-Wide Survey: A first catalogue of 831 emission line galaxies
• Gravitational-Wave Data Analysis. Formalism and Sample Applications: The Gaussian Case
• Lyα Emission from High Redshift Sources in COSMOS
• The effects of seeing on Sersic profiles
• The MUSE Extremely Deep Field: the Cosmic Web in Emission at High Redshift
• The MUSE-Wide Survey: A determination of the Lyman $\alpha$ emitter luminosity function at $3<z<6$
• LSDCat: Detection and cataloguing of emission-line sources in integral-field spectroscopy datacubes
• On the contribution of fluorescence to Ly$\alpha$ halos (LAHs) around star forming galaxies
• How to coadd images? I. Optimal source detection and photometry using ensembles of images
• Using negative detections to estimate source finder reliability
• Reconstruction of the ground-layer adaptive-optics point spread function for MUSE Wide Field Mode observations
• MUSE Spectroscopic Identifications of Ultra-Faint Emission Line Galaxies with M${}_{\mathrm{UV}}\sim$ -15
• Selection Functions in Astronomical Data Modeling, with the Space Density of White Dwarfs as Worked Example
• Surface Brightness Profile of Lyman-$\alpha$ Halos out to 320 kpc in HETDEX
• Detector sampling of optical/IR spectra: how many pixels per FWHM?
• ORIGIN: Blind detection of faint emission line galaxies in MUSE datacubes
• First HETDEX Spectroscopic Determinations of Ly$\alpha$ and UV Luminosity Functions at $z=2-3$: Bridging a Gap Between Faint AGN and Bright Galaxies
• Detection of companion galaxies around hot dust-obscured hyper-luminous galaxy W0410-0913
• On the Correct Estimate of the Probability of False Detection of the Matched Filter in Weak-Signal Detection Problems
• A Correlation Between Lyα Spectral Line Profile and Rest-Frame UV Morphology
• The MUSE-Wide survey: Three-dimensional clustering analysis of Lyman-$\alpha$ emitters at $3.3<z<6$
• The correct estimate of the probability of false detection of the matched filter in the detection of weak signals. II. (Further results with application to a set of ALMA and ATCA data)
• Rotational and rotational-vibrational Raman spectroscopy of air to characterize astronomical spectrographs
• Three Dimensional Optimal Spectral Extraction (TDOSE) from Integral Field Spectroscopy
• Correct estimate of the probability of false detection of the matched filter in weak-signal detection problems. III (Peak distribution method versus the Gumbel distribution method)
• Detection of new point-sources in WMAP Cosmic Microwave Background (CMB) maps at high Galactic latitude. A new technique to extract point sources from CMB maps
• The Utility of Lyman-alpha Emission Lines as a Probe of Interactions between High Redshift Galaxies and their Environments
• On the Automated and Objective Detection of Emission Lines in Faint-Object Spectroscopy
• Observations of Ly$\alpha$ Emitters at High Redshift
• Discovery of faint double-peak Halpha emission in the halo of low redshift galaxies
• The BlueMUSE data reduction pipeline: lessons learned from MUSE and first design choices

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